282 
SIDNEY F. HARMER. 
longed into a passage opening at the end of a projecting papilla. 
In this genus, howeAfer, the ovaries are situated between the 
ganglion and the intestine, whereas in Loxosoma they are 
found between the ganglion and the (Esophagus, as indicated 
Lv the position of the unpaired part of the generative duct. 
(Compare fig. 12 with fig. 14; notice also fig. 16, a male.) 
The ovary in L. Tethyae consists of a small number of cells, 
of which only one becomes mature at the same time (fig. 14). 
The cell which is becoming an ovum increases in size at the 
expense of the neighbouring ovarian cells ; the latter are 
absorbed by the egg, or rather appear to fuse with it, so 
that the nearly mature ovum contains several nuclei whose 
cells are separated from one another only by indistinct 
boundaries. These disappear in later stages, and the absorp- 
tion of other primordial ova by the developing ovum is then 
only indicated by the fact that the latter is polynuclear. At a 
still later stage presumably, the nuclei of the nutritive cells 
are absorbed, as the mature ovarian ovum contains only a 
single nucleus. In addition to this process of the fusion 
of several ovarian cells to form a single ovum, another 
method by which the latter is nourished takes place in 
L. Tethvae. In many of my sections the developing ovum is 
seen to be engaged in devouring curious masses marked vt. in 
fig. 14, and differing entirely in appearance from the ovarian 
cells. The latter stain readily with haematoxylin, whilst 
the bodies vt. hardly absorb any of this colouring matter ; 
they have in fact precisely the same appearance as the yolk 
material diffused through the mature ovum and segmentation 
spheres of this species of Loxosoma. There can hence be 
very little doubt that the bodies which are thus devoured by 
the ovum play the part of a vitellarium. In the ovaries of 
L. Tethyse I have seen no structures with any resemblance 
to the bodies in question, whilst the gland-cells occurring 
round the edge of the calyx (described by Salensky, vide his 
figure) behave in exactly the same manner with respect to 
colouring matters, and have the same characteristic granular 
appearance as the bodies vt. in fig. 14. These vitelline masses 
